diff --git a/types/joi/index.d.ts b/types/joi/index.d.ts
index 1b4c3fcbaf..02ac767427 100644
--- a/types/joi/index.d.ts
+++ b/types/joi/index.d.ts
@@ -138,6 +138,9 @@ export interface WhenOptions {
 export interface ReferenceOptions {
     separator?: string;
     contextPrefix?: string;
+    default?: any;
+    strict?: boolean;
+    functions?: boolean;
 }
 
 export interface IPOptions {